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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Diastolic dysfunction refers to an abnormality in how the heart fills with blood during diastole. The heart muscles do not relax in a normal manner and the heart may fill too slowly, asynchronously or with an elevation in filling pressure only.